Download RB-Pol-214 12V Step-Up Voltage Regulator U3V12F12 Description

RB-Pol-214
12V Step-Up Voltage Regulator U3V12F12
Description
The compact (0.32"×0.515") U3V12F12 switching step-up (or boost) voltage regulator takes an input
voltage as low as 2.5 V and efficiently boosts it to 12 V. The pins have a 0.1" spacing, making this
board compatible with standard solderless breadboards and perfboards.
Overview
These boost (step-up) voltage regulators generate higher output voltages from input voltages as low as
2.5 V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC
converters) and have a typical efficiency between 80% to 90%. The available output current is a
function of the input voltage, output voltage, and efficiency but the input current can typically be as
high as 1.4 A.
The regulator’s thermal shutdown prevents damage from overheating, but it does not have short-circuit
or reverse-voltage protection.
Features
• Input voltage: 2.5 V – VOUT
• Fixed 5 V, 9 V, or 12 V output with 4% accuracy
• 1.4 A switch allows for input currents up to 1.4 A
• 2 mA typical no-load quiescent current
• Integrated over-temperature shutoff
• Small size: 0.515" × 0.32" × 0.1" (13 × 8 × 3 mm)
Using the Regulator
Connections
The boost regulator has three connections: input voltage (VIN), ground (GND), and output voltage
(VOUT).
The input voltage, VIN, must be at least 2.5 V and should not exceed the output voltage, VOUT. Please
be wary of destructive LC spikes that might cause the input voltage to exceed VOUT.
The three connections are labeled on the back side of the PCB, and they are arranged with a 0.1"
spacing along the edge of the board for compatibility with solderless breadboards, connectors, and
other prototyping arrangements that use a 0.1" grid. You can solder wires directly to the board or solder
in either the 3×1 straight male header strip or the 3×1 right-angle male header strip that is included.
Typical Efficiency and Output Current
The efficiency of a voltage regulator, defined as (Power out)/(Power in), is an important measure of its
performance, especially when battery life or heat are concerns. As shown in the graphs below, this
switching regulator typically has an efficiency of 80 to 90%.
The maximum achievable output current is approximately proportional to the ratio of the input voltage
to the output voltage. If the input current exceeds the switch current limit (typically somewhere
between 1.4 and 2 A), the output voltage will begin to drop. Additionally, the maximum output current
can depend on other factors, including the ambient temperature, air flow, and heat sinking.
LC Voltage Spikes
When connecting voltage to electronic circuits, the initial rush of current can cause damaging voltage
spikes that are much higher than the input voltage. In our tests with typical power leads (~30" test
clips), input voltages above 10 V caused voltage spikes in excess of 20 V. You can suppress such spikes
by soldering a 33μF or larger electrolytic capacitor close to the regulator between VIN and GND.
Specifications:
Dimensions
• Size: 0.32" × 0.515" × 0.1"
• Weight: 0.4 g
General specifications
• Minimum operating voltage: 2.5 V
• Maximum operating voltage: 12 V
• Maximum input current: 1.5 A2
• Output voltage: 12 V
• Maximum quiescent current: 2 mA